Leinster have named four lions in their starting fifteen for their Pro12 match with Cardiff at the RDS tomorrow.
Brian O'Driscoll, Cian Healy and Rob Kearney all start alongside Jamie Heaslip, who will captain the side.
Fellow lions Rory Best and Tommy Bowe will start for Ulster against Treviso at Ravenhill.
Simon Zebo is the sole 2013 lion in Munster's starting fifteen for their match against the Dragons at Musgrave Park on Saturday, with Paul O'Connell named in the replacements.
Meanwhhile the IRFU has reiterated that the Irish provinces will not compete in any breakaway European club competition.
In a statement released this afternoon the Union said that the provinces "will not be participating in future tournaments which do not have the full approval of the International Rugby Board."
Gerry Thornley of the Irish Times touched on the issue, as well as referee Alain Rolland's retirement and the pitfalls for Sean O'Brien if he were to move to France.
